1. United States Pharmacopoeia, Monograph 87. Biological reactivity tests, in vitro, elution Test. USP 23/NF18. 1995. United States Pharmacopeial Convention, Inc., Rockville, MD, U.S.A.
2. International Standards Organization. Biological evaluation of medical devices—tests for cytotoxicity: in vitro methods. ISO 10993-5; 1992. International Organization for Standardization, Geneva, Switzerland.
3. Standards Australia/Standards New Zealand. Medical devices—single use urethral catheters for general medical use. AS/NZS 2696, Appendix B. 1997. Standards Australia, Homebush, NWS, Australia. Standards New Zealand, Wellington, New Zealand.